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Texas Instruments TPS2377PWR
- Part No.:
- TPS2377PWR
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS2377PWR.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,112
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Product details
Overview
TPS2377PWR from Texas Instruments is an IEEE 802.3af-compliant Powered Device (PD) controller IC for Power over Ethernet applications, integrating a 0.58-Ω 100-V low-side MOSFET switch, fixed 450-mA operational current limit, legacy UVLO thresholds (30.5 V turn-on / 35.1 V turn-off), and open-drain power-good reporting. It operates across –40°C to 85°C and supports VoIP phones, WLAN access points, and security cameras with PoE input.
For engineers reviewing the TPS2377PWR datasheet, TPS2377PWR pinout, TPS2377PWR application, or TPS2377PWR equivalent, key selection considerations include its legacy UVLO behavior, TSSOP-8 package compatibility, inrush current programmability via ILIM pin, and classification resistor support for Class 0–4 PDs per IEEE 802.3af.
Technical Context
The TPS2377PWR implements detection, classification, and undervoltage lockout using dedicated comparators with hysteresis-specifically optimized for legacy PoE systems with lower PSE output voltage margins. Its functional block includes a current-limited pass device, PG comparator referenced to RTN, and internal bias regulation derived from VDD.
Unlike the TPS2376, it lacks a UVLO pin and uses fixed thresholds; unlike the TPS2375, it features reduced UVLO hysteresis (4.5 V) and lower turn-on voltage (35.1 V nominal) to accommodate noncompliant PSEs. The ILIM pin enables adjustable inrush limiting (100–180 mA range) while CLASS and DET pins interface with external resistors for IEEE-defined classification and detection signature generation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| UVLO Turn-On Threshold | 35.1 V (nominal); enables PD startup at lower PSE voltages than 802.3af-compliant TPS2375, supporting legacy infrastructure. |
| UVLO Turn-Off Threshold | 30.5 V (nominal); maintains operation through cable voltage drop during sustained load, with 4.5 V hysteresis. |
| Operational Current Limit | 450 mA (typical); hard current limit on RTN pin protects downstream DC/DC converter and load from overload. |
| Inrush Current Range | 100–180 mA (programmable via ILIM resistor); prevents input voltage sag during bulk capacitor charging. |
| Pass Device RDS(on) | 0.58 Ω (typical at 300 mA); low conduction loss enables high-efficiency power delivery to PoE loads. |
| Power-Good Output | Open-drain PG referenced to RTN; asserts high-impedance state only when RTN voltage exceeds 10.0 V and inrush has terminated. |
| ESD Rating | 15-kV system-level (contact/air) at RJ-45; meets industrial robustness requirements without external protection. |
Pinout & Package
TSSOP-8 package (PW-8), 3.0 mm × 4.4 mm, 0.65 mm pitch, thermally enhanced with exposed pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - ILIM | Inrush current programming input | Connects to VSS via resistor (62.5–500 kΩ) to set start-up inrush limit; open or short prohibited. |
| 2 - CLASS | Classification current output | Sinks classification current (38–41 mA for Class 4) into external resistor to signal PD power class to PSE. |
| 3 - DET | Detection signature output | Pulls low during detection phase to generate 25-kΩ incremental resistance signature with R(DET) = 24.9 kΩ. |
| 4 - VSS | Input return reference | Local ground for detection/classification circuitry; connects to source side of input diode bridge. |
| 5 - RTN | Switched output return | Low-side return path for load; carries full operational current (≤450 mA); used as PG comparator reference. |
| 6 - PG | Power-good status output | Open-drain output pulled to RTN internally; requires external pullup to VDD or logic rail for active-high signaling. |
| 7 - NC | No connection | Unbonded pin; must remain unconnected per TI design; not UVLO-capable like TPS2376 Pin 7. |
| 8 - VDD | Positive input supply | Accepts rectified PoE input (0–57 V); powers internal circuitry and serves as voltage monitoring point for UVLO. |
Key Features
| Feature | Design Value |
|---|---|
| Legacy UVLO thresholds | 35.1 V turn-on / 30.5 V turn-off enables reliable startup with older PSEs delivering <44 V minimum output. |
| Programmable inrush control | ILIM pin supports 100–180 mA inrush range via external resistor, preventing line voltage collapse during capacitor charge. |
| Integrated 100-V low-side switch | 0.58-Ω RDS(on) MOSFET eliminates need for discrete pass device, reducing BOM count and layout area. |
| IEEE 802.3af Class 0–4 support | CLASS pin sinks precise currents (e.g., 39.4 mA for Class 4) with ±1% resistor tolerance to ensure PSE recognition. |
| True open-drain PG reporting | PG referenced to RTN-not VSS-enables accurate power-good assertion even under varying load return conditions. |
Applications
| VoIP Phones | WLAN Access Points |
|---|---|
Use Scenario: Powered via Category 5/6 Ethernet cabling in enterprise office deployments with mixed-generation PSE switches. IC Role / Device Role / Timing Role: PD controller managing detection, classification, and regulated power delivery to baseband processor and audio codec. Use Value: Legacy UVLO ensures stable startup with older Cisco Catalyst 3560 PoE+ switches delivering ~38 V under load. |
Use Scenario: Ceiling-mounted dual-band APs requiring PoE power with minimal thermal footprint in confined enclosures. IC Role / Device Role / Timing Role: Primary power management IC enabling hot-swap capability and MPS maintenance for PSE supervision. Use Value: Integrated 0.58-Ω switch minimizes conduction loss and self-heating, supporting continuous 802.11ac operation at 85°C ambient. |
| Security Cameras | POS Terminals |
Use Scenario: Outdoor IP cameras deployed with passive PoE injectors lacking full 802.3af compliance. IC Role / Device Role / Timing Role: Front-end PD controller interfacing with input diode bridge and DC/DC converter for image sensor and encoder. Use Value: 15-kV system-level ESD rating eliminates need for external TVS diodes on RJ-45 lines, reducing cost and board space. |
Use Scenario: Retail countertop terminals powered over Ethernet in environments with frequent plug/unplug cycles. IC Role / Device Role / Timing Role: Reliable PD interface ensuring graceful power-down and re-detection after cable disconnection. Use Value: PG output tied to microcontroller reset logic provides deterministic boot sequencing upon valid PoE presence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Powered Device controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS2375PW | Fixed 802.3af-compliant UVLO (39.3 V / 30.5 V); higher hysteresis (8.8 V); no legacy mode. | Required for new designs targeting full IEEE 802.3af certification with modern PSEs. | Select TPS2375PW when interoperability with certified PSEs (e.g., Ubiquiti UniFi, Aruba Instant On) is mandatory. |
| TPS2376PW | Adjustable UVLO via external resistor divider on UVLO pin; otherwise functionally identical to TPS2375. | Suitable for field-upgradeable systems needing configurable turn-on voltage across multiple PSE generations. | Choose TPS2376PW only if design requires dynamic UVLO threshold tuning-otherwise TPS2377PWR offers simpler BOM. |
Compared with TPS2375PW and TPS2376PW, the TPS2377PWR delivers optimized startup behavior for legacy infrastructure without external components, trades hysteresis margin for lower turn-on voltage, and avoids the complexity of UVLO resistor networks required by the TPS2376PW.
Availability
TPS2377PWR is available at Aetrix Electronics and suitable for VoIP phones, WLAN access points, and security cameras requiring stable component supply in industrial and commercial PoE deployments.
Supply support for TPS2377PWR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of leadership in power management and industrial interface solutions.
The TPS237x family was designed specifically for IEEE 802.3af Power over Ethernet Powered Device applications, emphasizing integration, reliability, and interoperability across diverse PSE implementations.
FAQ
What is the primary function of the TPS2377PWR in a PoE system?
The TPS2377PWR serves as a Powered Device (PD) controller that manages the full IEEE 802.3af handshake sequence-including detection, classification, and undervoltage lockout-for devices receiving power over Ethernet. It integrates a 100-V low-side switch, programmable inrush control, and open-drain power-good signaling. The TPS2377PWR specifically targets legacy PoE infrastructure with its optimized UVLO thresholds, making it distinct from the TPS2375PWR and TPS2376PWR variants.
How does the TPS2377PWR differ from the TPS2375PWR in UVLO behavior?
The TPS2377PWR uses legacy UVLO thresholds-35.1 V turn-on and 30.5 V turn-off-designed for compatibility with older PSEs delivering less than 44 V. In contrast, the TPS2375PWR implements full 802.3af-compliant thresholds (39.3 V / 30.5 V) with higher hysteresis (8.8 V). This difference means the TPS2377PWR starts up earlier but with less voltage margin, which improves reliability in noncompliant installations but may cause instability with slowly ramping compliant PSEs.
Can the TPS2377PWR be used in Class 4 PoE applications?
Yes, the TPS2377PWR fully supports IEEE 802.3af Class 4 operation. When a 255-Ω ±1% classification resistor is connected between CLASS and VSS, the TPS2377PWR sinks 39.4 mA (typical) during classification-within the 36–44 mA specification for Class 4. Its 450-mA operational current limit and 0.58-Ω RDS(on) also sustain the 12.95 W maximum PD input power defined for Class 4 under worst-case cable loss.
What is the role of the ILIM pin on the TPS2377PWR?
The ILIM pin on the TPS2377PWR sets the inrush current limit during PD startup by connecting an external resistor (62.5–500 kΩ) to VSS. With a standard 178-kΩ resistor, the TPS2377PWR limits inrush to 130 mA (typical), preventing input voltage sag that could trigger premature UVLO shutdown. This programmability allows designers to match inrush behavior to bulk capacitance size and PSE current capability-critical for robust operation with legacy injectors.
Is the TPS2377PWR pin-compatible with other devices in the TPS237x family?
Yes, the TPS2377PWR is pin-compatible with the TPS2375PW and TPS2376PW in the TSSOP-8 (PW-8) package. All three share identical pin assignments for VDD, VSS, DET, CLASS, RTN, PG, ILIM, and NC. However, Pin 7 is NC on the TPS2377PWR and TPS2375PW but functions as UVLO input on the TPS2376PW-requiring PCB layout verification if substituting across variants.
TPS2377PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Controller (PD)
- Number of Channels:
- 1
- Power - Max:
- 12.95 W
- Internal Switch(s):
- Yes
- Auxiliary Sense:
- No
- Standards:
- 802.3af (PoE)
- Voltage - Supply:
- 0V ~ 57V
- Current - Supply:
- 240µA
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
TPS2377PWR FAQ
1.How can I place an order for TPS2377PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS2377PWR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TPS2377PWR reliable?
The price and inventory of TPS2377PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS2377PWR is usually 5 days.
3.What payment methods are accepted for TPS2377PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS2377PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS2377PWR?
TPS2377PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS2377PWR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TPS2377PWR?
For technical support, including TPS2377PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS2377PWR requirements.
6.How does Aetrix verify that TPS2377PWR is sourced from the original manufacturer or authorized distributors?
All TPS2377PWR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS2377PWR meets industry standards.
7.What is the process for return or replacement of TPS2377PWR?
All TPS2377PWR units undergo pre-shipment inspection (PSI). If there is an issue with TPS2377PWR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TPS2377PWR part is unused and in its original packaging.
Return procedure for TPS2377PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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